It's quite likely that your little plants are settling in. Now they have been planted out their roots have no bounds, so they are probably concentrating on growing a strong root system. Once they've done that, they'll concentrate on growth above ground.
They may also have been set back a little if they were being cossetted indoors, then planted out without being hardened off for 10 days or so before being planted out.
Welcome to the forum btw
Thank you very much for the welcome 🤗 I did indeed cosset them 😆….the begonia tubers are starting to come along lovely..no flowers yet 🤷🏻♀️…but I didnt start them off early enough from what I’ve since read….
I wouldn’t worry about planting the begonia tubers too late. In my own experience plants have a habit of catching up when the conditions are right - warmth, water and daylight. Better late than too early, when they would sit in cold wet soil, not root and eventually rot.
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Billericay - Essex
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Wisdom is not putting it in a fruit salad.
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Begonia semperflorens (fibrous rooted begonias) - these are small plants (about 10") that have no tubers and produce small flowers.
Tuberous Begonia are the ones that grow from a tuber about 2" across (similar to a bulb) - these ones produce the huge blousy double blooms
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.